Corrupted graphics after the login until the unity launcher appears

[zzecool]

[Impact]
After login, it's very possible the screen will appear corrupted and show artifacts of a previous session. This is a security and privacy concern.

[Test Case]
Simple as logging in several times. It's highly reproducable (over 50% in my tests).

[Regression Potential]
Seems low. We had this same patch in 12.04, but it got accidentally dropped for 12.10.

[Original Report]
With the latest updates im getting corrupted graphics - images after the login until the unity launcher - desktop appears and this is happening in every system restart - relogin.

Im attaching a screenshot of what im getting , it looks like its a combination of corrupted images from the windows that was running while i was doing the latest updates , my last session before the problem.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: xorg 1:7.6+10ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-15.24-generic 3.2.5
Uname: Linux 3.2.0-15-generic x86_64
NonfreeKernelModules: nvidia
.proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module 290.10 Wed Nov 16 17:39:29 PST 2011
 GCC version: gcc version 4.6.2 (Ubuntu/Linaro 4.6.2-12ubuntu1)
.tmp.unity.support.test.0:

ApportVersion: 1.91-0ubuntu1
Architecture: amd64
CompizPlugins: [core,bailer,detection,composite,opengl,decor,regex,animation,snap,move,place,mousepoll,vpswitch,wall,resize,gnomecompat,workarounds,compiztoolbox,grid,imgpng,expo,fade,ezoom,scale,session,switcher,unityshell]
CompositorRunning: compiz
Date: Tue Feb 14 11:40:18 2012
DistUpgraded: Log time: 2011-09-27 15:36:23.910451
DistroCodename: precise
DistroVariant: ubuntu
GraphicsCard:
 NVIDIA Corporation G86 [GeForce 8600M GS] [10de:0425] (rev a1) (prog-if 00 [VGA controller])
   Subsystem: Sony Corporation Device [104d:9005]
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
JockeyStatus:
 xorg:nvidia_current - NVIDIA accelerated graphics driver (Proprietary, Enabled, In use)
 xorg:nvidia_current_updates - NVIDIA accelerated graphics driver (post-release updates) (Proprietary, Disabled, Not in use)
MachineType: Sony Corporation VGN-FZ31Z
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-15-generic root=UUID=12e02107-7815-4276-b7ac-7bceee898897 ro quiet splash vt.handoff=7
SourcePackage: xorg
UpgradeStatus: Upgraded to precise on 2012-02-02 (11 days ago)
XorgConf:
 Section "Device"
  Identifier "Default Device"
  Option "NoLogo" "True"
 EndSection
dmi.bios.date: 12/21/2007
dmi.bios.vendor: Phoenix Technologies LTD
dmi.bios.version: R2110J7
dmi.board.asset.tag: N/A
dmi.board.name: VAIO
dmi.board.vendor: Sony Corporation
dmi.board.version: N/A
dmi.chassis.asset.tag: N/A
dmi.chassis.type: 10
dmi.chassis.vendor: Sony Corporation
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvrR2110J7:bd12/21/2007:svnSonyCorporation:pnVGN-FZ31Z:pvrC6006UGW:rvnSonyCorporation:rnVAIO:rvrN/A:cvnSonyCorporation:ct10:cvrN/A:
dmi.product.name: VGN-FZ31Z
dmi.product.version: C6006UGW
dmi.sys.vendor: Sony Corporation
version.compiz: compiz 1:0.9.7.0~bzr2995-0ubuntu1
version.ia32-libs: ia32-libs 20090808ubuntu33
version.libdrm2: libdrm2 2.4.30-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 8.0~rc2-0ubuntu5
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 8.0~rc2-0ubuntu5
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu3
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.99.901+git20120126-0ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20111219.aacbd629-0ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu3
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20111201+b5534a1-1build2

[zzecool (zzecool)]

I just tried to remove the Nvidia Restricted drivers and use the Ubuntu Default one the "nouveau" with the same results .

Im attaching the new corrupted screenshot

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[dum (dummyxl)]

I have the same artifacts, I have a acer timeline 4810 with a ati 4310 graphic card.
So not only Nvidia has this problem i guess.

First started when the compiz update was installed. (a week ago i think it was)

[dum (dummyxl)]

ps I use Ubuntu alpha 12.04

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Bryce Harrington (bryce)]

If the regression started a week ago due to compiz, that would narrow it to this update:

upgrade compiz 2012-02-14 10:46:44 1:0.9.6+bzr20110929-0ubuntu8 1:0.9.7.0~bzr2995-0ubuntu1

One way to isolate this better would be if someone able to reproduce this would test downgrading to the earlier compiz and verify the bug goes away then.

[Bryce Harrington (bryce)]

Alternatively, try seeing if the issue still occurs if you log in with either Ubuntu2d or the Gnome Classic (No effects) session?

I suspect this is a dupe of bug #933322

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Daniel van Vugt (vanvugt)]

In duplicate bug 932611, Jason found that the problem still occurs with Unity 2D and Gnome Shell. So not a compiz issue (unless it's a different bug).

[matthieu vidal (mvidal0001)]

I confirm this is something I've got with gnome-shell

and I use a RADEON HD 4800

[dum (dummyxl)]

One way to isolate this better would be if someone able to reproduce this would test downgrading to the earlier compiz and verify the bug goes away then.

I want to help you whit this but how do i downgrade compiz? can't see a older package on synaptic.
If you want to help me, I would appreciated.

now i have

ralph@ralph-Aspire-4810T:~$ apt-cache policy compiz
compiz:
  Geïnstalleerd: 1:0.9.7.0~bzr2995-0ubuntu4apt-cache show upstart
  Kandidaat: 1:0.9.7.0~bzr2995-0ubuntu4
  Versietabel:
 *** 1:0.9.7.0~bzr2995-0ubuntu4 0
        500 http://nl.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages
        100 /var/lib/dpkg/status

[Bryce Harrington (bryce)]

Older versions of compiz .debs can be downloaded from launchpad via package history:

https://launchpad.net/ubuntu/+source/compiz/+publishinghistory

Click on the desired version there on the right, and snag the appropriate .debs for your HW from under Builds at lower right.

However I suspect to downgrade compiz you may need to downgrade a few other things as well.

[Bryce Harrington (bryce)]

@matthieu, for now let's treat the corruption with -ati as a separate bug (see lp: #933322). It's possible the bugs are one and the same, but the corruption pattern is a bit different, and I'm not 100% certain we've ruled out that this might be a driver-specific issue.

[Bryce Harrington (bryce)]

I'm re-adding the -nvidia task. Omer's probably right that it is not a bug in -nvidia, but I'd like to track it with the nvidia bugs until we're 100% sure which package brought the regression.

[dum (dummyxl)]

I have downloaded the compiz version but can't instal it at this time, the software-center crashed all the time... (bug 827615).
i can't install anything manual at this time.

[Bryce Harrington (bryce)]

If you have the debs locally, you can install from the commandline via
"dpkg -i <*.deb>"

On Wed, Feb 22, 2012 at 10:08:12PM -0000, dum wrote:
> I have downloaded the compiz version but can't instal it at this time, the software-center crashed all the time... (bug 827615).
> i can't install anything manual at this time.
>
> --
> You received this bug notification because you are a member of Ubuntu-X,
> which is subscribed to nvidia-graphics-drivers in Ubuntu.
> https://bugs.launchpad.net/bugs/931967
>
> Title:
> Corrupted graphics after the login until the unity launcher appears
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/unity/+bug/931967/+subscriptions
>
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[Omer Akram (om26er)]

I believe something in LightDM have changed (no denying this is a bug) but previously at the login screen of lightdm you grab the topbar and move it you would see your desktop wallpaper behind but now you see this corruption behind. as that's the point where compiz is not even started.

[Omer Akram (om26er)]

in summary previously lightdm was hiding a bug that appeared now (TM)

[Alex Moldovan (alexmoldovan)]

100% reproducible on:
02:00.0 VGA compatible controller [0300]: NVIDIA Corporation G86 [Quadro NVS 290] [10de:042f] (rev a1)

...and

01:00.0 VGA compatible controller [0300]: NVIDIA Corporation G84 [GeForce 8600M GT] [10de:0407] (rev a1) (prog-if 00 [VGA controller])

Also happening when using the nvidia_current.

[dum (dummyxl)]

I did a downgrade to compiz-core_0.9.6+bzr20110929-0ubuntu8_amd64.deb
It still happens, (and breaks the compiz desktop) i did a upgrade again and my desktop effect are back ;-)

Maybe Omer Akram is right and not a compiz problem but Lightdm?

[dum (dummyxl)]

ps. inside the distortion of the last desktop session. I can sometimes read texts from the last time i shutdown.

[dum (dummyxl)]

example:
https://lh6.googleusercontent.com/--HLHUsM7L3E/T0gpM-Pq4BI/AAAAAAAACaI/twIT90inTTo/s800/Screenshot%20at%202012-02-23%2008%3A27%3A43.png

[Rainer Rohde (rainer-rohde)]

I get a similar corruption when I log in as shown in the screenshot in #23.

[Hedson Ralston (masterchiefb117)]

I was browsing around to see if this was a localized problem on certain machines but I guess not. I have the same issue on both ubuntu and ubuntu 2d logins. It scrambles the the screen for about 5 secs before desktop comes up (on 2d, I had an extra gray screen). I have recreated each scenario I could think of,
1. Fresh install of 12.04
2. Upgrade from previous LTS to 12.04
3. Reconstruct image file of 12.04 before install(kinda works but will have bad graphics on login which is almost near impossible to login without auto login)

I am currently working on getting 12.04 working correctly on Dual Boot on my Asus Transformer and I did come acoss this issue after the whole install completed. Logged in and bam came out, looked like bad reception in tv. I was able to modify certain parts of ubuntu start up what my fiends and I were working on to help alleviate the stress load on my tab. Apparently we disabled something and the errors went away for that portion just after log in. I tried to recreate he same environment on my Asus laptop running nvidia 9800m and it looked like I had found a solution. Well almost except that I had another computer set for auto log in and it didnt run into any problems. On a manual log in, I get super artificial images that it becomes impossible to log in. Had to reinstall ubuntu all over again.

I cant post my pics up yet, I was at work when this was going down and I took video of the process so Ill take screen caps of what happen. FIle wise, I will find a place to upload and see if you guys can confirm the script works just remember to enable auto log in before restarting.

[Raphaël Badin (rvb)]

FWIW I'm also getting the corrupted graphic using the *nouveau* video driver (GeForce 8400M GS) on precise.

[Mark Hannon (markhannon)]

I can confirm Raphael's comment - I am alsing using nouveau on a Lenovo W510 (mainly as the nvidia driver has constant graphics corruption problems) and also have the @login corruption

[Jason Smith (jassmith)]

The GPU initialization routine doesn't seem to 0 out its memory. Our best bet is probably to figure out how we can initialize the framebuffer contents earlier. (Im looking at you lightdm)

[Achim Behrens (k1l)]

Upgraded from 11.10 to 12.04 and using nvidia-current with a 8600gtm with unity and twinview with external monitor.

I had some sort of this "puzzle" on the external monitor since oneiric.
Now its on both screens but IIRC its just black and gray and not the things from the last login.

[Alberto Milone (albertomilone)]

@Daniel Dadap: any ideas about this?

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/934003

[Soumyadeep Chanda (deep-fatality)]

Very critical bug, happens on my nvidia hardware on both nouveau and nvidia proprietary drivers. It shows contents of previous sessions which include pictures/video screens, text, website content etc. so very critical security issue is here.

[Daniel Dadap (ddadap)]

If it's true that similar issues show up in Nouveau, and on AMD boards (radeon? fglrx?), then it probably makes the most sense to track down the regression better first. There's still a chance that there could be bugs in all of the affected drivers that are causing this, but it would be great if we could begin investigating with some more solid information about the problem first.

[Doug McMahon (mc3man)]

This 1st occurred with the upgrade of unity-greeter to unity-greeter 0.2.1-0ubuntu1 though I believe the issue has been identified as being in lightdm

Unfortunately it's not that straightforward to test reverting back to that version due to dep changes with g-s-d, ect.

(if one was to install the gtk-greeter, switch to it for 1 restart, then switch back to the unity-greeter the 'corruption' will usually go away for a restart or 2, then start creeping back in

[Bryce Harrington (bryce)]

Yes, it appears to be unity-greeter causing the trouble. It uses cairo calls to paint the root window, which it persists on the screen using X's RetainPermanent functionality, and currently the suspicion is that there's a flaw in amongst that logic.

Chris Halse Rogers is going to be working on this.

[Matthias Klose (doko)]

> inside the distortion of the last desktop session.
> I can sometimes read texts from the last time i shutdown.

maybe not a security issue, but definitely a privacy issue

[Thomas Bushnell, BSG (tbushnell)]

data leakage is a security issue :)

[Žilvinas (zilvinas-urbon)]

Very anoying bug.

[gyanny (gyanny)]

I have the same bug on my installation of precise pangolin with an graphics card ATI X200M and open drivers

[Rainer Rohde (rainer-rohde)]

This bug makes logging in when someone's standing behind you watching a real thrill. *what did I look at y'day? Can they see bits and pieces of it?* :)

[brian baker (brian-m-baker)]

this is not just a nvidia-current bug it is also seen on intel graphics too!
i am running 2 different versions of 12.04 beta one with intel and one with nvidia graphics and both have the same distortions.

[André Lopes (zipatei)]

Ati the same issue here.

[Timo Reimerdes (timorei)]

Running a nvidia card.
Loggin in to gnome-shell (no unity installed)

I get corruption, sometimes actually showing previous contents of the screen - so I'd actually flag this as having SECURITY IMPLICATIONS.

If it were only garbage, meh. But old (and different users!) information like text-snippets and images are clearly readable.

Different drivers make no difference.

[Rainer Rohde (rainer-rohde)]

We had a similar issue with Oneiric during its developmental phase as well.

[Shannon Frailey (frailey46)]

Happens on my Asus G51j with the GTS 360m and on my desktop with HD 4870. Definite security issue. The nvidia card isn't readable usually but my ATI card show the whole screen completely readable with the right 200-300 pixels distorted. Showing contents of my previous session.

[Chris Halse Rogers (raof)]

Ok. Investigating the unity-greeter code, I've found two problems:

1) The X connection marked as RetainPermanent for the background pixmap is closed almost immediately. This would not ordinarily be a problem, but the GTK connection is marked as DestroyAll (the default) and is the only X client connected. When the greeter quits, it closes the final X connection, and this triggers a different behaviour in the server - all resources, even those from RetainPermanent clients, are destroyed.

This turns out not to be the actual problem, because
2) The greeter only sets the backing pixmap of the root window once, on creation, and before it's actually been drawn to. This invokes undefined behaviour - the X server makes no guarantees that drawing to the pixmap will be reflected in the backing pixmap. This would seem to be why on !intel you get random VRAM contents during login - the pixmap used as the backing store is uninitialised. It only accidentally works on intel.

Now, my attempts at fixing 2) so far don't seem to work - for some reason I get a black transition rather than a seamless background transition on all (except maybe the first?) login?

[Doug McMahon (mc3man)]

while I doubt this is of any help, - the greeter & transition did work perfectly here on nvidia with unity-greeter (0.2.0-0ubuntu6)
(& currently work once - in certain scenarios inc. on the first login on a fresh install

[Robert Ancell (robert-ancell)]

Hi Chris,

The daemon should also have a connection to the X server to stop the X server resetting - do you think this is not working?

[André Lopes (zipatei)]

I do not know if it helps, but the same happens when I open SuperTuxKart.

[jan2ary (jan2ary)]

Affects me also with AMD RV620.

[Thomas Bushnell, BSG (tbushnell)]

An additional data point, consistent with what's been said here, is that our users with lightdm and unity-greeter who log in to a gnome-shell session instead of a unity session see exactly the same sort of corruption.

[André Lopes (zipatei)]

I upgraded my kernel, and can no longer install fgrlx. But now notice something strange with the vesa driver. See photo.

This moment UBuntu 12.04 - unity 2d

When this screen appears, it now seems that corruption happens fgrlx.

[Sebastian Bugiu (sebastian-bugiu)]

I also get this and I'm not using nvidia but Amd graphics chip.

[Rainer Rohde (rainer-rohde)]

I noticed that when coming out of suspend, instead of getting a full-screen corruption, I am only getting corruption on the Unity Launcher, top to bottom. As soon as I move my mouse over the Launcher, the corruption disappears.

[Sascha Jazbec (jazbec)]

Unity checks for "bad" PCI-IDs and graphics drivers every time ubuntu 12.x boots up. Based on the decision if your gpu is "bad", it will then automatically present either the Unity 3d or the 2d environment.

I think this graphical corruption the user sees is the hidden checking process that runs in the background and tests the gpu's features or polls for the device-id and the driver being in use.

[kocckokook (kockoap-deactivatedaccount)]

I have the same problem on my Samsung RV520-S01 !

I'm using a fresh installation of ubuntu 12.04 (from netinstall) and the recommended nvidia driver from the repo(Geforce 520M).

In the beginning it was a white screen with a lot of dots (various colors) now it's like a screenshot from a previous session (I can see the "finish recording" when I use kazam.. 4-5 reboot ago).

[Chris Halse Rogers (raof)]

@Robert: Ah, I didn't notice the daemon's X connection. If it maintains one, then that aspect should be good.

The other point stands; XSetWindowBackgroundPixmap is well within its rights to take a copy of the drawable you pass in, and is documented to not require the pixmap to remain around - ie: we shouldn't have to set a custom CloseDownMode; DestroyAll should be fine.

[Chris Halse Rogers (raof)]

Ok. So, fixing the other problems didn't work because unity-greeter was never actually drawing to the pixmap it created - the code to draw the background was bubbling through GTK, and hitting
[+20.72s] CRITICAL: gtk_widget_draw: assertion `!widget->priv->alloc_needed' failed’

So, unity-greeter was setting the background pixmap to an uninitialised pixmap, netting random VRAM contents on !intel, and, for some strange reason, the correct image on Intel.

I should now be able to fix this.

[Launchpad Janitor (janitor)]

This bug was fixed in the package unity-greeter - 0.2.5-0ubuntu2

---------------
unity-greeter (0.2.5-0ubuntu2) precise; urgency=low

  * debian/patches/fix_login_corruption.patch:
    - Fix setting of root window background pixmap. Fixes "corruption"
      seen between unity-greeter and Unity start, which was actually just
      random bits of VRAM in an uninitialised pixmap. (LP: #931967)
 -- Christopher James Halse Rogers <email address hidden> Tue, 20 Mar 2012 18:51:43 +1100

[Thomas Bushnell, BSG (tbushnell)]

I'm concerned that this bug exposes a very severe security bug in X, at
least, on affected hardware.

If I understand correctly, I could create a pixmap, not initialize it, and
thus gain access to various bits of previous screen real-estate. (Note
that people have seen on their display desktop bits from the previous
login, or from the previous *boot *provided the system hasn't been powered
off.)

Can we start the process now for addressing that?

On Tue, Mar 20, 2012 at 1:25 AM, Launchpad Bug Tracker <
<email address hidden>> wrote:

> This bug was fixed in the package unity-greeter - 0.2.5-0ubuntu2
>
> ---------------
> unity-greeter (0.2.5-0ubuntu2) precise; urgency=low
>
> * debian/patches/fix_login_corruption.patch:
> - Fix setting of root window background pixmap. Fixes "corruption"
> seen between unity-greeter and Unity start, which was actually just
> random bits of VRAM in an uninitialised pixmap. (LP: #931967)
> -- Christopher James Halse Rogers <email address hidden> Tue, 20 Mar 2012
> 18:51:43 +1100
>
> ** Changed in: unity-greeter (Ubuntu Precise)
> Status: In Progress => Fix Released
>
> --
> You received this bug notification because you are a member of Goobuntu
> Team, which is subscribed to the bug report.
> https://bugs.launchpad.net/bugs/931967
>
> Title:
> Corrupted graphics after the login until the unity launcher appears
>
> Status in OEM Priority Project:
> Triaged
> Status in OEM Priority Project precise series:
> In Progress
> Status in “unity-greeter” package in Ubuntu:
> Fix Released
> Status in “unity-greeter” source package in Precise:
> Fix Released
>
> Bug description:
> With the latest updates im getting corrupted graphics - images after
> the login until the unity launcher - desktop appears and this is
> happening in every system restart - relogin.
>
> Im attaching a screenshot of what im getting , it looks like its a
> combination of corrupted images from the windows that was running
> while i was doing the latest updates , my last session before the
> problem.
>
> ProblemType: Bug
> DistroRelease: Ubuntu 12.04
> Package: xorg 1:7.6+10ubuntu1
> ProcVersionSignature: Ubuntu 3.2.0-15.24-generic 3.2.5
> Uname: Linux 3.2.0-15-generic x86_64
> NonfreeKernelModules: nvidia
> .proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory:
> '/proc/driver/nvidia/gpus/0'
> .proc.driver.nvidia.registry: Binary: ""
> .proc.driver.nvidia.version:
> NVRM version: NVIDIA UNIX x86_64 Kernel Module 290.10 Wed Nov 16
> 17:39:29 PST 2011
> GCC version: gcc version 4.6.2 (Ubuntu/Linaro 4.6.2-12ubuntu1)
> .tmp.unity.support.test.0:
>
> ApportVersion: 1.91-0ubuntu1
> Architecture: amd64
> CompizPlugins:
> [core,bailer,detection,composite,opengl,decor,regex,animation,snap,move,place,mousepoll,vpswitch,wall,resize,gnomecompat,workarounds,compiztoolbox,grid,imgpng,expo,fade,ezoom,scale,session,switcher,unityshell]
> CompositorRunning: compiz
> Date: Tue Feb 14 11:40:18 2012
> DistUpgraded: Log time: 2011-09-27 15:36:23.910451
> DistroCodename: precise
> DistroVariant: ubuntu
> GraphicsCard:
> NVIDIA Corporation G86 [GeForce 8600M GS] [10de:0425] (rev a1) (prog-if
...

[Christian Mariucci (cmariucci)]

Here the problem is gone with the latest update. Thanks!

01:05.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI RS880 [Radeon HD 4200]

[Miguel Branco (mpbbranco)]

And here the problem is NOT gone with the last update.

I'm on Beta 1 and compiled/installed 0.2.5ubuntu2. Did I miss some Beta 2 extra update ?

Card is ATI X700.

Screen still showing either "displaced" full login screen or multiple black login-like tiles on top.

Also now logging out from session may sometimes present issues like multiple restarts of lightdm. Didn't notice that before.

[zzecool (zzecool)]

@Chris Halse Rogers Problem is fixed for me , thank you !

Im the bug reporter so my specs is known , thanks again .

[graingert (tagrain)]

@tbushnell I think the first challenge is to build a test case for this.

a solution presumably would be to clear all video memory on shutdown/logoff

[cacula (cacula)]

Here the problem is gone with the latest update. Thanks!

[Timo Reimerdes (timorei)]

Clearing the video-memory on shutdown would not be enough.

Security also includes preventing users from aquiring knowledge they never wanted to get:

Example: Brother watches pron on windows or playing games with high violence levels - 8 yo sister logs on to linux to see some d*ck or chopped off bits?

So, that memory needs to be cleared during start.

[gyanny (gyanny)]

for me works fine. well done
video card is ATI X200M

[Raphaël Badin (rvb)]

Problem fixed with the latest release (5.7.0-0ubuntu1) on my GeForce 8400M GS . Well done guys!

[Kieran Hogg (xerosis)]

Hmm, I'm not getting corrupted graphics but I am getting my desktop before I restarted for a few seconds before my new one appears. Radeon HD 4670

[Miguel Branco (mpbbranco)]

I'm glad that many others had their issue solved, maybe I have a different bug: I've never had this problem of reading from previous sessions, but the screen is corrupted from after login until the background is drawn (so actually before unity launcher).

Can anyone tell if this is another bug ?

[Chris Van Hoof (vanhoof)]

Verified fix on 12.04 (plus -updates from today) on a:

 * NVIDIA Corporation GF108 [GeForce GT 440]

Thanks!

--chris

[morryis (morryis)]

Corrupted graphics are gone, but there is no neatless blending from greeter to desktop. The display now turns black between greeter and desktop (NVIDIA 8800-GTX)

[JG (jdogzz-g5)]

After the corruption problem was fixed, on my computer the screen now stays frozen except for the mouse, then goes straight to the desktop background after about 10 or 15 seconds.

[Miguel Branco (mpbbranco)]

Nevermind, will try my luck elsewhere, i'll surely find somewhere where "my" login-corruption bug is described and still open.

[nuttzo33 (slucas1979)]

I'm getting a different problem now with the latest update , i have to log in twice after a reboot or a fresh boot The first time i login through the unity greeter it drops me back to the greeter and after that i can log in successfully. I think i had a similar problem during the 11.10 cycle.Is anyone else experiencing this ?

[Simeon (simeon5)]

Fixed here now. Thanks!

[dum (dummyxl)]

fixed here to.
acer timeline 4810 (ati gpu)

[James Gifford (jamesgifford)]

I'm still experiencing this issue. Open source ATI drivers, AMD Radeon
HD 6320. Might be my dual-monitor setup though.

[Doug McMahon (mc3man)]

@ morryis (morryis) -
see if this bug is what's affecting you
Bug 964761

[Omer Akram (om26er)]

@Rainer comment#54 that's bug 915265

[zemadz (zemadz)]

Not sure if this fix is complete. I'm still getting corrupted looking screen for a few seconds after login, sometimes it is just garbled graphics, other times it is a picture from the last session (what was on the screen before last shutdown).

Thinkpad T60 (X1400, 12.04 x64, using external screen)

[Piyush Roy (piyush2k13)]

I also faced same issue even it said that bug is fixed.

[rpr nospam (rpr-nospam)]

I also see this bug on an Ubuntu 12.04 64-bit machine with ATI Radeon HD 4350.

$ lspci | grep VGA
01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI RV710 [Mobility Radeon HD 4300 Series]

$ uname -a
Linux hostname 3.2.0-25-generic #40-Ubuntu SMP Wed May 23 20:30:51 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

$ dpkg -l | grep unity-greeter
ii unity-greeter 0.2.8-0ubuntu1.1 Unity Greeter

[graingert (tagrain)]

this needs to be re-opened for quantal

[matthieu vidal (mvidal0001)]

this problem re-appears on 12.10 beta

HD 4800 without fglrx

[jolindbe (jolindbe)]

This bug still affects me on Ubuntu 12.04. I have noticed that if I change wallpaper, the problem does not appear the next reboot, instead I get a completely black screen for some time. But the next reboot after that, the problem is back. Would it be possible to make some workaround that replaces the wallpaper (preferrably by the same wallpaper) every log-out or log-in?

[jolindbe (jolindbe)]

Ok, I've probably found a workaround:
Edit the file /etc/gdm/PostSession (which is executed at logout) and add the following line before the line "exit 0":
gsettings set org.gnome.desktop.background picture-uri file:///Path_to_your_desktop_background.jpg
The standard backgrounds are found in /usr/share/backgrounds/ if you need to know where to start looking.
This seems to solve the problem for me, and displays a black screen during the previously mosaic-garbled seconds of the login. But I wouldn't call it a "fix", though. And the privacy/security issue should still be looked into. Where is this information stored?

[rpr nospam (rpr-nospam)]

As suggested by jolindbe, on Ubuntu 12.04 I've invoked the following command:
gsettings set org.gnome.desktop.background picture-uri 'file:///usr/share/backgrounds/Precise_Pangolin_by_Vlad_Gerasimov.jpg'

which fixed the issue of corrupted graphics after the user login (for the user who invoked the command). After several reboots it's still OK.

This could be put in a logout script but I'd say that /etc/gdm/PostSession/Default is not a good choice for Ubuntu 12.04 as it uses
lightdm instead of GDM.

[jolindbe (jolindbe)]

Since invoking this command I've seen a garbled black-ish screen twice during login (out of maybe 5-6 logins), but no previous sessions can be distinguished. On the other logins, the screen is black with a movable cursor for the same few seconds.
If rpr-nospam has another suggestion as of from where to invoke the command, please let me know.

[Rob Cannell (r-cannell)]

I see a scrambled login screen during login, but no info from previous sessions. It has been like this since I upgraded from Lucid a few weeks ago.

Ubuntu 12.04 AMD 64 bit.

lspci | grep VGA
01:05.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Radeon 2100

[Vliegendehuiskat (vliegendehuiskat)]

This same problem exists on 12.10, so this needs to be reopened.

lspci | grep VGA
01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Blackcomb [Radeon HD 6900M series]

[jolindbe (jolindbe)]

After the "fix", the problem persists on 12.04. In a boot from power-off, the screen is just black/white garbled noise for 5-10 seconds after login, but after a reboot it shows garbled-up chunks of old sessions (despite my workaround above).

Ubuntu 12.04 32 bit
lspci | grep VGA
01:00.0 VGA compatible controller: NVIDIA Corporation GT218 [NVS 3100M] (rev a2)

[alex (r0)]

The same bug is on 12.10 (32-bit).

lspci | grep VGA
01:00.0 VGA compatible controller: NVIDIA Corporation G86 [GeForce 8400M GS] (rev a1)

Using nvidia-experimental-310.

[Valentin Žagar (gintrnis)]

same here
01:00.0 VGA compatible controller: NVIDIA Corporation GF106GLM [Quadro 2000M] (rev a1)
Ubuntu 12.10 64bit with nvidia-current-updates
Any1 on this?

[Michael Terry (mterry)]

I agree that this is still a problem on at least 12.10. I could reproduce on my nvidia 32-bit machine.

I've tracked it down to some piece of commit 490 (http://bazaar.launchpad.net/~unity-greeter-team/unity-greeter/trunk/revision/490). That was a big commit though, and I'm digging further.

[Michael Terry (mterry)]

Quick follow up. I believe I've narrowed my 12.10 reproduction down to one sub-commit of revision 490 (revision 410.2.3): http://bazaar.launchpad.net/~unity-greeter-team/unity-greeter/trunk/revision/410.2.3

Looking further to try to make a fix.

[Michael Terry (mterry)]

OK. The problem with 12.10 was that the code responsible for drawing the background between logging in and the session starting (which was fixed in 12.04 previously in this bug) was accidentally dropped completely. That was my fault. :-/ I've got a new branch up, which should easily make it into 13.04. Once it does, I'll start an SRU for 12.10.

Now, as for why 12.04 is regressing... I'm not sure. I can't reproduce myself and the code looks fine to me.

There may be a further bug affecting 12.04 in small quantities or certain hardware configs (vs the 12.10 bug which affected everybody). In which case, it would also affect 12.10 in those same configs even after my fix. But that's less of a problem than fixing 12.10 for most people.

[Launchpad Janitor (janitor)]

This bug was fixed in the package unity-greeter - 13.04.0-0ubuntu1

---------------
unity-greeter (13.04.0-0ubuntu1) raring; urgency=low

  * New upstream release
    - Support timed login
    - Drop OK button in session chooser (LP: #1049243)
    - Various small layout changes (LP: #1049241, LP: #1049242,
      LP: #1056945, LP: #1056949, LP: #1056987, LP: #1059484)
    - Fix orca not closing when disabled
    - Fix display corruption when logging in (LP: #931967)
  * debian/patches/close-orca.patch,
    debian/patches/fix-timed-autologin.patch,
    debian/patches/do-not-mention-citrix-support.patch,
    debian/patches/sigterm-onboard.patch:
    - Dropped, included upstream
 -- Michael Terry <email address hidden> Fri, 04 Jan 2013 10:37:29 -0500

[Michael Terry (mterry)]

OK, I've uploaded to raring. I've also uploaded to quantal-proposed and subscribed ~ubuntu-sru.

[Brian Murray (brian-murray)]

Hello zzecool, or anyone else affected,

Accepted unity-greeter into quantal-proposed. The package will build now and be available at http://launchpad.net/ubuntu/+source/unity-greeter/12.10.4-0ubuntu5.1 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, and change the tag from verification-needed to verification-done. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed. In either case, details of your testing will help us make a better decision.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance!

[Sapsan (sergiy-bagnak)]

Hello Brain.

It looks like that the new package fixed the error. But only bug, which was appeared after login. The same bug is still present after returning from the lock screen with the screen turns off.

[Sapsan (sergiy-bagnak)]

Hmmm.... Bug still present from login -- got it 5 times successively.

ubuntu 12.10 x86_64
lspci | grep VGA
01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Barts PRO [Radeon HD 6800 Series]

[Michael Terry (mterry)]

Sapsan, just to confirm, you have 12.10.4-0ubuntu5.1 installed?

I remember it working on my machine when I tested it. I no longer have quantal on actual hardware. Could we get a third opinion?

[Doug McMahon (mc3man)]

See no sign of screen corruption here in 12.10 with nvidia display adapter (nvidia 8400m
Tested with both nouveau & nvidia drivers on a multi-boot setup.
Additionally tested with grub configured on 12.10, 12.94 & 13.04

What is quite common is a black screen from greeter after initiating the login till the Desktop appears, but that isn't corruption.
So for at least this hardware consider verification done

[Doug McMahon (mc3man)]

typo above ^, that would be 12.04, sorry..

[Sapsan (sergiy-bagnak)]

Yes, unity-greeter 12.10.4-0ubuntu5.1

[James Tait (jamestait)]

This appears fixed for me on Ubuntu 12.10 with NVIDIA GPU GeForce GT 330M (GT216) and nvidia-current-updates 304.51-0ubuntu1.

[Launchpad Janitor (janitor)]

This bug was fixed in the package unity-greeter - 12.10.4-0ubuntu5.1

---------------
unity-greeter (12.10.4-0ubuntu5.1) quantal-proposed; urgency=low

  * debian/patches/fix-corruption.patch:
    - Fix likely screen corruption after logging in (LP: #931967)
 -- Michael Terry <email address hidden> Fri, 04 Jan 2013 14:13:10 -0500

[Sapsan (sergiy-bagnak)]

Please, retest with "Automatic Login" enabled. Maybe fast PC needed. I use Intel i5-2500k + fast SSD.

[Ari Fogel (arifogel)]

This bug persists for me in Ubuntu 13.04 with:
unity-greeter: 13.10.3-0ubuntu1
nvidia-319: 319.32-0ubuntu7
I have the Nvidia GTX 295. I also use an SSD like Sapsan, though I don't know if that is relevant.

[D. Charles Pyle (dcharlespyle)]

I am seeing the same things as reported above, and I am seeing this in 14.04 LTS. I switched to fglrx to try to get rid of the corruption and still saw it, although it was less than while using the Open Source drivers for AMD/ATi. Tearfree created other problems so I went back to Open Source. Now the video corruption is back again, and sometimes it includes bits of desktop from a previous session even after a reboot.

I even tried switching to another ppa to get the latest and greatest versions from git and still see the corruption while waiting for the greeter to be ready for logon, and between greeter screen and logon to desktop, as well as when I log off and wait for the greeter to return to ready.

ASUS/ATi Radeon HD 5750, dual head with a pair of Dell S2440L LCD monitors. Ubuntu 14.04.2 LTS.

Wanted to try the above workaround but this system does not use GDM, so no directory or files on which to do the same edits.

$ lsb_release -a
LSB Version: core-2.0-amd64:core-2.0-noarch:core-3.0-amd64:core-3.0-noarch:core-3.1-amd64:core-3.1-noarch:core-3.2-amd64:core-3.2-noarch:core-4.0-amd64:core-4.0-noarch:core-4.1-amd64:core-4.1-noarch:cxx-3.0-amd64:cxx-3.0-noarch:cxx-3.1-amd64:cxx-3.1-noarch:cxx-3.2-amd64:cxx-3.2-noarch:cxx-4.0-amd64:cxx-4.0-noarch:cxx-4.1-amd64:cxx-4.1-noarch:desktop-3.1-amd64:desktop-3.1-noarch:desktop-3.2-amd64:desktop-3.2-noarch:desktop-4.0-amd64:desktop-4.0-noarch:desktop-4.1-amd64:desktop-4.1-noarch:graphics-2.0-amd64:graphics-2.0-noarch:graphics-3.0-amd64:graphics-3.0-noarch:graphics-3.1-amd64:graphics-3.1-noarch:graphics-3.2-amd64:graphics-3.2-noarch:graphics-4.0-amd64:graphics-4.0-noarch:graphics-4.1-amd64:graphics-4.1-noarch:languages-3.2-amd64:languages-3.2-noarch:languages-4.0-amd64:languages-4.0-noarch:languages-4.1-amd64:languages-4.1-noarch:multimedia-3.2-amd64:multimedia-3.2-noarch:multimedia-4.0-amd64:multimedia-4.0-noarch:multimedia-4.1-amd64:multimedia-4.1-noarch:printing-3.2-amd64:printing-3.2-noarch:printing-4.0-amd64:printing-4.0-noarch:printing-4.1-amd64:printing-4.1-noarch:qt4-3.1-amd64:qt4-3.1-noarch:security-4.0-amd64:security-4.0-noarch:security-4.1-amd64:security-4.1-noarch
Distributor ID: Ubuntu
Description: Ubuntu 14.04.2 LTS
Release: 14.04
Codename: trusty

$ apt-show-versions unity-greeter
unity-greeter:amd64/trusty-updates 14.04.11-0ubuntu1 uptodate

[Igor Lopez (igor-lopez)]

I see exactly this on a fresh install of 14.04.2 LTS where I first installed the server image in order for it to pick up my Raid configuration and afterwards installed the ubuntu-desktop. The corrupted area covers aproximately 30% of the lower part of the right screen.

I am using the nvidia properitary driver (version 331.113 from nvidia-331 , Card GeForce 9400 GT) for a dual screen setup and it is only the right screen that is affected for approximately 5 seconds before the screen becomes normal.

Log in as guest does not give me the same dual screen setup, e.g. there I have two screens with same content and no corrupted screen.

[MatthiasA (themaze)]

I got the same bug as described by Igor Lopez.

OS: elementaryos Freya
Nvidia GTX 570
Nvidia Driver Version 352.30

[D. Charles Pyle (dcharlespyle)]

Has been happening and still happens since the first install of 12.04. I am now at 14.04.3 and the bug still is there. The difference is that I see millions of little cubes, which then jump into big ones that show my previous session from Windows or Fedora, depending on what I was using just prior to Ubuntu! Any way to introduce code into lightDM that flushes the buffers in ATi/AMD cards so that previous contents don't show up? I don't have this problem with GDM.

[D. Charles Pyle (dcharlespyle)]

Just realized I needed to add that I am not using proprietary drivers. ATi Radeon HD 5750, using identical Dell S2440L monitors using identical HDMI cables. I tried to use the proprietary drivers but the problem remained, although with some improvement.

[D. Charles Pyle (dcharlespyle)]

$ lsb_release -a
LSB Version: core-2.0-amd64:core-2.0-noarch:core-3.0-amd64:core-3.0-noarch:core-3.1-amd64:core-3.1-noarch:core-3.2-amd64:core-3.2-noarch:core-4.0-amd64:core-4.0-noarch:core-4.1-amd64:core-4.1-noarch:cxx-3.0-amd64:cxx-3.0-noarch:cxx-3.1-amd64:cxx-3.1-noarch:cxx-3.2-amd64:cxx-3.2-noarch:cxx-4.0-amd64:cxx-4.0-noarch:cxx-4.1-amd64:cxx-4.1-noarch:desktop-3.1-amd64:desktop-3.1-noarch:desktop-3.2-amd64:desktop-3.2-noarch:desktop-4.0-amd64:desktop-4.0-noarch:desktop-4.1-amd64:desktop-4.1-noarch:graphics-2.0-amd64:graphics-2.0-noarch:graphics-3.0-amd64:graphics-3.0-noarch:graphics-3.1-amd64:graphics-3.1-noarch:graphics-3.2-amd64:graphics-3.2-noarch:graphics-4.0-amd64:graphics-4.0-noarch:graphics-4.1-amd64:graphics-4.1-noarch:languages-3.2-amd64:languages-3.2-noarch:languages-4.0-amd64:languages-4.0-noarch:languages-4.1-amd64:languages-4.1-noarch:multimedia-3.2-amd64:multimedia-3.2-noarch:multimedia-4.0-amd64:multimedia-4.0-noarch:multimedia-4.1-amd64:multimedia-4.1-noarch:printing-3.2-amd64:printing-3.2-noarch:printing-4.0-amd64:printing-4.0-noarch:printing-4.1-amd64:printing-4.1-noarch:qt4-3.1-amd64:qt4-3.1-noarch:security-4.0-amd64:security-4.0-noarch:security-4.1-amd64:security-4.1-noarch
Distributor ID: Ubuntu
Description: Ubuntu 14.04.3 LTS
Release: 14.04
Codename: trusty